JPH08306295A - Tripping electromagnet device for circuit breaker - Google Patents

Abstract

PURPOSE: To miniaturize an electromagnet device, and to obtain the use of an automatic wire winding machine so as to facilitate the wire winding work by using a bobbin having a winding core part having different winding core diameters. CONSTITUTION: An electromagnetic coil 13 is wound around a winding core part 20b of a bobbin 20 by an automatic wire winding machine, and a winding- start lead wire 13a and a winding-end lead wire 13b are drawn outside through guide grooves 20g, 20h. The periphery of the coil 13 is insulated by an insulating member 21 having a width wider than that of the winding core part 20b. An electromagnetic coil 14 is wound around the coil 13 and winding core parts 20c, 20d by an automatic wire winding machine, and a winding-start lead wire 14a is insulated and drawn outside through a guide groove 20i. A winding-end lead wire 14b is drawn outside from the periphery of the coil 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tripping electromagnet device for a circuit breaker such as a wiring breaker or an earth leakage breaker, and more specifically, a tripping electromagnet having two types of tripping functions. It relates to the device.

[0002]

2. Description of the Related Art FIGS. 3 to 5 show, for example, JP-A-5-266.
It is a side view which shows the trip device in the conventional circuit breaker shown by the 779 publication. In the drawing, reference numeral 1 is a tripping electromagnet device, and 2 is a tripping lever operated by the tripping electromagnet device 1. The principle configuration is shown in the drawing. The tripping electromagnet device 1 is provided with a fixed iron core 4 fixed to the center of a U-shaped yoke 3 and a movable iron core 5 facing the fixed iron core 4. The electromagnetic coil portion 6 is fitted. Electromagnetic coil section 6
Is a bobbin 8 on which the first and second electromagnetic coils 13 and 14 are wound. A pair of permanent magnets 7 are provided on both legs of the yoke 3, and an iron piece 11 is interposed between the permanent magnet 7 and the movable iron core 5. Both legs are connected by a support piece 12. In addition, the movable iron core 5 is a support piece 12
Is provided so as to be slidable in the iron core insertion hole 8a of the bobbin 8. One end of a trip rod 9 is fixed to the center of the movable iron core 5, and the other end penetrates the fixed iron core 4 and the yoke 3 and extends to a position facing the trip lever 2. A return spring 10 is provided between the head portion 9a of the tripping rod 9 and the yoke 3, and is normally biased so that the movable iron core 5 contacts the fixed iron core 4.

As shown in FIG. 4, the bobbin 8 of the electromagnetic coil portion 6 has a rectangular outer shape so that it can be fitted inside the yoke 3, and by providing the collar portions 8d, 8e, 8f at both ends and the center, Two winding cores, that is, a first winding core 8b and a second winding core 8c are formed. As the first and second electromagnetic coils, for example, an overcurrent trip coil and a voltage trip coil (a shunt trip coil), or an overcurrent trip coil and an earth leakage trip are provided on the core portions 8b and 8c. Two types of electromagnetic coils 13 like coils,
14 are wound. In this case, the first electromagnetic coil 1
The winding start lead wire 13a and the winding end lead wire 13b of 3 are from the left end of the electromagnetic coil portion 6, and the winding start lead wire 14a and the winding end lead wire 14b of the second electromagnetic coil 14 are outward from the right end of the electromagnetic coil portion 6. Has been pulled out.

On the other hand, the trip lever 2 is rotatably supported by a mold case (not shown) via a pin 15.
A tripping spring 16 suspended between the mold case and the mold case is biased to rotate clockwise in the drawing. Due to this biasing, the intermediate portion of the trip lever 2 contacts the head portion 9a of the trip rod 9, and the tip portion of the trip lever 2 faces the trip crossbar 17 of the circuit breaker with a predetermined gap. Is configured.

In such a conventional circuit breaker tripping electromagnet device, for example, if the first electromagnetic coil 13 is for overcurrent tripping, and the second electromagnetic coil 14 is for earth leakage tripping, In the normal state of the circuit breaker, neither the first electromagnetic coil 13 nor the second electromagnetic coil 14 is energized. Therefore, the permanent magnet 7 → the iron piece 11
→ Movable iron core 5 → Fixed iron core 4 → The magnetic force of the permanent magnet 7 generated by the magnetic path of the yoke 3 and the urging force of the return spring 10 cause the movable iron core 5 to resist the urging force of the trip spring 16 and the fixed iron core 4. Will be attracted to the electromagnetic coil 13 and will be maintained as long as the electromagnetic coil 13 or 14 is not energized.

Now, when the first and second electromagnetic coils are an overcurrent trip coil and an earth leakage trip coil, for example, an earth leakage detection signal from an earth leakage detection circuit (not shown) is the second one. When applied to the electromagnetic coil 14, the second electromagnetic coil 14 is energized so as to generate a magnetic flux in the direction opposite to that of the permanent magnet 7. Since the magnetic force of the permanent magnet 7 is weakened by this energization, the biasing force of the trip spring 16 becomes stronger than the attraction force of the permanent magnet 7 and the biasing force of the return spring 10, and as shown in FIG. Is separated from the fixed iron core 4. Along with this, the trip lever 2 is rotated clockwise in FIG. 3 by the urging force of the trip spring 16, and this rotation actuates the trip crossbar 17. As a result, the lock of the opening / closing mechanism (not shown) is released and the movable contactor is opened (generally referred to as trip operation). When the movable iron core 5 is separated from the fixed iron core 4, the magnetic resistance increases, and the attracting force on the movable iron core 5 sharply decreases. Due to the decrease in the attraction force, when the movable iron core 5 is separated, for example, to the stroke S in FIG. Separated until fully compressed.

[0007]

In the conventional tripping electromagnet device for a circuit breaker as described above, one type of electromagnet device 1 includes two types of electromagnetic coils 13 and 14 having different tripping functions.
In order to accommodate different trip signals, it is possible to convert them into one mechanical motion. Such a tripping electromagnet device 1
In the common bobbin 8, two core parts 8 are provided.
b, 8c are formed, and the first and second electromagnetic coils 1 having a wire diameter and the number of turns corresponding to the tripping function are formed on the core portions 8b, 8c.
3, 14 are wound. Therefore, the bobbin 8 becomes long and the electromagnet device becomes large, which may be an obstacle to downsizing the circuit breaker. In addition, both electromagnetic coils 13,
Since the winding start lead wires 13a and 14a and the winding end lead wires 13b and 14b of 14 are respectively pulled out from both sides of the bobbin 8, there has been a problem that it is difficult to assemble the tripping electromagnet device.

Further, it is conceivable that the bobbin 8 is shortened by winding the electromagnetic coils 13 and 14 in two layers with the winding core at one place. In this case, the electromagnetic coil 13 is wound first. When the core is wound to the full width, when the electromagnetic coil 14 is wound thereon, it becomes difficult to insulate between the electromagnetic coils 13 and 14 in the vicinity of the collar of the bobbin. Electromagnetic coil 13,
If the winding width of any of the electromagnetic coils of 14 is reduced, the insulation becomes easy, but there is a problem that winding by the automatic winding machine becomes difficult.

The present invention has been made in order to solve the above-mentioned problems. The tripping electromagnet device having two types of electromagnetic coils can be miniaturized, and an automatic winding machine can be used. An object of the present invention is to obtain an electromagnet device for tripping a circuit breaker, which facilitates wire work.

[0010]

SUMMARY OF THE INVENTION A tripping electromagnet device for a circuit breaker according to the present invention includes a first winding core portion having a predetermined winding core diameter and both sides of the first winding core portion. In addition, the second core portion formed to have a larger core diameter than the first core portion, the lead wire guide groove formed in the second core portion, and the core inserted into the center portion. Using a bobbin having a hole, a first electromagnetic coil wound around a first winding core of the bobbin and having a lead wire drawn out through the lead wire guide groove, and a second winding core of the bobbin. A second electromagnetic coil in which the lead wire is pulled out through the lead wire guide groove and is wound,
And an iron core inserted into the iron core insertion hole.

[0011]

In the electromagnet device for tripping the circuit breaker constructed as described above, the first electromagnet device having the predetermined core diameter is formed.
Of the first core and the first core located on both sides of the first core.
A bobbin having a second winding core formed with a winding core diameter larger than that of the winding winding enables use of an automatic winding machine and facilitates insulation and downsizes an electromagnet device for tripping. Work like.

[0012]

【Example】

Example 1. FIG. 1 shows an electromagnet device for tripping a circuit breaker according to an embodiment of the present invention.
7 and 9 to 17 are the same as those of the above-mentioned conventional device, and the description thereof will be omitted. Reference numeral 20 denotes a bobbin made of a synthetic resin molded product, the details of which are formed as shown in FIG.
That is, the first core portion 20b formed in a predetermined core diameter around the iron core insertion hole 20a, and the first core portion 20.
The second core portions 20c and 20d, which are formed on the both sides of b and have a core diameter larger than that of the first core portion 20b, and the second core portions 20c and 20d, respectively, are provided on the outer sides. Collar portions 20e, 20f, second winding core portion 20d, and collar portion 20f.
And the lead wire guide grooves 20g, 20h, 20i formed in the above.

With respect to the bobbin 20 described above, the first electromagnetic coil 13 is wound around the first winding core portion 20b by an automatic winding machine,
The winding start lead wire 13a and the winding end lead wire 13b are insulated by a flexible insulating tube or the like and drawn out through the lead wire guide grooves 20g and 20h. The outer circumference of the first electromagnetic coil 13 wound as described above is the first
It is insulated by an insulating member 21 such as an insulating tape or insulating paper having a width wider than the core 20b. Next, the second electromagnetic coil 14 is wound by an automatic winding machine on the upper side of the first electromagnetic coil 13 around which the insulating member 21 is wound and the second winding core portions 20c and 20d, and the winding start is started. The lead wire 14a is insulated by a flexible insulating tube or the like so that the lead wire guide groove 20
It is drawn out through i. The winding end lead wire 14b is led out from the outer peripheral portion of the second electromagnetic coil 14.
The lead wire guide grooves 20g, 20h, 20i are shown in FIG.
By making it meander like the lead wire guide groove 20g shown in (4), it can also be used as a retainer for an insulating tube or the like.
If the bobbin core is formed in three stages, a tripping electromagnet device having three types of electromagnetic coils is also possible.

The electromagnetic coil portion 6 constructed as described above has a yoke 3, a fixed iron core 4, a movable iron core 5, a permanent magnet 7, a return spring 10, an iron piece 11, a support piece 12, etc., as in the conventional device. The tripping electromagnet device 1 is configured in combination with. The relationship between the trip lever 2 and the trip crossbar 17 is the same as in the conventional device. Therefore, the trip operation is similarly performed.

[0015]

Since the tripping electromagnet device of the circuit breaker of the present invention is configured as described above, it has the following effects.

In order to wind a plurality of types of electromagnetic coils having different tripping functions, there are, for example, a first winding core portion having a predetermined winding core diameter and a first winding core portion provided on both sides of the first winding core portion. Since the bobbin having the second winding core formed to have a larger winding core diameter than the first winding core is used, the automatic winding machine can be used and the winding work is facilitated. .

Further, since a plurality of types of electromagnetic coils are superposed and wound, the length of the electromagnetic coil portion is shortened, and therefore the tripping electromagnet device is miniaturized.

Furthermore, since the lead wire at the start of winding and the lead wire at the end of winding are drawn out through the lead wire guide groove provided in the second winding core portion, the lead wire guide groove serves as a receiving portion for the soldering portion of the lead wire. Also available as Further, since the bulge due to the lead wire does not occur in the winding core portion, the winding end treatment work becomes easy.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing a trip electromagnet device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a bobbin according to an embodiment of the present invention.

FIG. 3 is a partially cutaway side view showing a conventional tripping electromagnet device.

FIG. 4 is a perspective view showing a conventional bobbin.

FIG. 5 is a partially cutaway side view showing the operation of the conventional device.

[Explanation of symbols]

1 tripping electromagnet device, 2 tripping lever, 3 yokes, 4 fixed iron cores, 5 movable iron cores, 6 electromagnetic coil parts,
7 permanent magnet, 9 trip rod, 10 return spring, 1
1 Iron Piece, 12 Support Piece, 13 First Electromagnetic Coil, 1
4 second electromagnetic coil, 13a, 14a winding start lead wire, 13b, 14b winding end lead wire, 20 bobbin,
20a iron core insertion hole, 20b first winding core portion, 20c,
20d Second core portion, 20e, 20f Collar portion, 20
g, 20h, 20i Lead wire guide groove.

Claims (1)

[Claims] 1. A first core portion formed to have a predetermined core diameter, and a core diameter larger than that of the first core portion on both sides of the first core portion. A second bobbin, a lead wire guide groove formed in the second bobbin, a bobbin having an iron core insertion hole in the center, and the bobbin wound around the first bobbin. A first electromagnetic coil having a lead wire drawn out through a lead wire guide groove; a second electromagnetic coil wound around a second winding core of the bobbin and having a winding start lead wire drawn through the lead wire guide groove; An electromagnet device for tripping a circuit breaker, comprising an iron core inserted into the iron core insertion hole.